Method and apparatus for identifying substrate surface relief an

Details Method and apparatus for identifying substrate surface relief an Method and apparatus for identifying substrate surface relief an

1995-05-05

1996-05-28

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355208, 356371, 356376, 347221, G03G 2100, G01B 1100

Patent

active

055216927

ABSTRACT:
A method and apparatus for identifying surface relief features of a substrate processed in a printing machine, and adjusting the machine parameters as a function thereof, before the substrate is processed through the machine. The apparatus includes a light source positioned adjacent to the substrate surface. A light sensing device, in a light receiving relationship with the substrate surface, detects light reflected from the substrate surface. A signal is generated indicative of sensed light intensity with a first magnitude range indicating ridges and a second magnitude range indicating depressions. Control circuitry, electrically connected to the light sensing device, receives the signals of ridges and depressions, and discriminates between them to generate a set of signals indicating surface relief features of the substrate.

REFERENCES:
patent: 5099287 (1992-03-01), Sato
patent: 5109236 (1992-04-01), Watanabe et al.
patent: 5225890 (1993-06-01), Lee et al.
patent: 5237404 (1993-08-01), Tanaka et al.
patent: 5289267 (1994-02-01), Busch et al.

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